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loop: More stable FPS

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This commit is contained in:
Hajime Hoshi 2017-07-12 02:09:46 +09:00
parent 80b10b2d49
commit 15f5d2a2cc
1 changed files with 14 additions and 3 deletions
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17
internal/loop/run.go
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@ -40,6 +40,7 @@ type runContext struct {
lastAudioFrame int64 lastAudioFrame int64
lastAudioFrameTime int64 lastAudioFrameTime int64
deltaTime int64 deltaTime int64
targetDeltaTime int64
} }
var currentRunContext *runContext var currentRunContext *runContext
@ -134,11 +135,22 @@ func (c *runContext) adjustedNowWithAudio() int64 {
c.lastAudioFrameTime = n c.lastAudioFrameTime = n
} }
if f := audio.CurrentContext().Frame(); c.lastAudioFrame != f { if f := audio.CurrentContext().Frame(); c.lastAudioFrame != f {
an := c.lastAudioFrameTime + (f-c.lastAudioFrame)*int64(time.Second)/audio.FPS c.targetDeltaTime += (f-c.lastAudioFrame)*int64(time.Second)/audio.FPS - (n - c.lastAudioFrameTime)
c.deltaTime += an - n
c.lastAudioFrame = f c.lastAudioFrame = f
c.lastAudioFrameTime = n c.lastAudioFrameTime = n
} }
switch {
case c.deltaTime > c.targetDeltaTime:
c.deltaTime -= int64(time.Millisecond)
if c.deltaTime < c.targetDeltaTime {
c.deltaTime = c.targetDeltaTime
}
case c.deltaTime < c.targetDeltaTime:
c.deltaTime += int64(time.Millisecond)
if c.deltaTime > c.targetDeltaTime {
c.deltaTime = c.targetDeltaTime
}
}
return n + c.deltaTime return n + c.deltaTime
} }
@ -174,7 +186,6 @@ func (c *runContext) render(g GraphicsContext) error {
// As t is not accurate 1/60[sec], errors are accumulated. // As t is not accurate 1/60[sec], errors are accumulated.
// To make the FPS stable, set tt 1 if t is a little less than 1/60[sec]. // To make the FPS stable, set tt 1 if t is a little less than 1/60[sec].
// TODO: Better stabilizing way for FPS
if tt == 0 && (int64(time.Second)/int64(fps)-int64(5*time.Millisecond)) < t { if tt == 0 && (int64(time.Second)/int64(fps)-int64(5*time.Millisecond)) < t {
tt = 1 tt = 1
} }